Index: Doxyfile
==================================================================
--- Doxyfile
+++ Doxyfile
@@ -9,13 +9,14 @@
 PREDEFINED = OF_HAVE_PROPERTIES		\
 	     OF_HAVE_OPTIONAL_PROTOCOLS	\
 	     OF_HAVE_BLOCKS		\
 	     OF_HAVE_THREADS		\
 	     OF_SENTINEL		\
+	     OF_REQUIRES_SUPER		\
 	     OF_RETURNS_RETAINED	\
 	     OF_RETURNS_NOT_RETAINED	\
 	     OF_RETURNS_INNER_POINTER	\
 	     OF_CONSUMED		\
 	     OF_WEAK_UNAVAILABLE
 MACRO_EXPANSION = YES
 EXPAND_ONLY_PREDEF = YES
 IGNORE_PREFIX = OF of_

Index: src/OFObject.h
==================================================================
--- src/OFObject.h
+++ src/OFObject.h
@@ -45,10 +45,14 @@
 #endif
 
 #ifndef __has_feature
 # define __has_feature(x) 0
 #endif
+
+#ifndef __has_attribute
+# define __has_attribute(x) 0
+#endif
 
 #ifdef __GNUC__
 # define __GCC_VERSION__ (__GNUC__ * 100 + __GNUC_MINOR__)
 #else
 # define __GCC_VERSION__ 0
@@ -85,10 +89,16 @@
 #if defined(__clang__) || __GCC_VERSION__ >= 406
 # define OF_SENTINEL __attribute__((sentinel))
 #else
 # define OF_SENTINEL
 #endif
+
+#if __has_attribute(objc_requires_super)
+# define OF_REQUIRES_SUPER __attribute__((objc_requires_super))
+#else
+# define OF_REQUIRES_SUPER
+#endif
 
 #ifdef OF_APPLE_RUNTIME
 # if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || \
     defined(__ppc__)
 #  define OF_HAVE_FORWARDING_TARGET_FOR_SELECTOR

Index: src/OFThread.h
==================================================================
--- src/OFThread.h
+++ src/OFThread.h
@@ -176,11 +176,11 @@
  * @brief This routine is exectued when the thread's main method has finished
  *	  executing or terminate has been called.
  *
  * @note Be sure to call [super handleTermination]!
  */
-- (void)handleTermination;
+- (void)handleTermination OF_REQUIRES_SUPER;
 
 /*!
  * @brief Starts the thread.
  */
 - (void)start;